Bythocypris weddellensis Brandão, 2008, sp. nov.

• Main Author: Brandão, Simone N.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Ostracoda; Podocopida; Bairdiidae; Bythocypris; Bythocypris weddellensis; Southern Ocean; Weddell Sea; Weddell; Seta
• Online Access: https://zenodo.org/record/6233672; https://doi.org/10.5281/zenodo.6233672

Bythocypris weddellensis sp. nov. (Figs. 18, 39– 42) Etymology. In reference to its occurrence in the Weddell Sea. Material. 3 A. Holotype: 1 A M (SNB 0191), ANDEEP III # 142 – 5 –E, ZMH K­ 41325. Paratypes: 1 A M (SNB 0398), ANDEEP II, # 136 – 4 –E, ZMH K­ 41327. 1 A F (SNB 0251), ANDEEP III # 80 – 9 –E, ZMH K­ 41326. Distribution. Weddell Sea, Southern Ocean (Atlantic Sector), 3102 to 4782m. Measurements (Fig. 18). Holotype, LV, L 1.04mm, H 0.52mm; RV, L 1.04mm, H 0.50mm. Paratypes, LV, A M L 1.07mm, H 0.53mm; AF, L 1.22mm, H 0.63mm. Diagnosis. Valves small, smooth, glossy, oval/sub­rectangular in lateral view. Podomere VI of AII with 1 large claw, 2 medium­sized setae, and 1 short seta. Vibratory plate of MxI with 7 strahlen and around 25 feathered setae. Vibratory plate of ApV with 4 or 5 strahlen and around 10 feathered setae; podomere V with 1 large claw and 2 short setae. Fu with 5 tiny proximal setae and 3 medium­sized distal setae. Hemipenis with sub­hemispherical basal capsule; with a tubular, short and thick distal process, copulatory tube short and curved. Genital lobe sub­oval with a distal, strongly sclerotized, beak­shaped process. Description. Valves small, smooth, glossy, oval/sub­rectangular in lateral view. Larger valve with rounded outline; smaller valve with slightly angulated outline; posterior margin obtuse, and less broadly rounded than anterior margin; dorsal margin slightly arched; faint or no ventral indentation; fused marginal zone narrow, with numerous straight marginal pore canals; vestibules constricted. Carapace compressed laterally. Adductor muscle scars composed of 3 anterior scars plus one posterodorsal scar. Single female valves considerably larger than both males. In the holotype RV is larger than LV, in both paratypes LV is larger than RV. Labrum and hypostome bairdioid in structure (not elongated). AI robust, with not very long setae; chaetotaxy 1 (0/0), 2 (1 /0), 3 (2 /0), 4 (0/ 0­1), 5 (2 / 2), 6 (3 / 2), 7 (0/0: 5). AII robust, with short and thick podomeres; exopodite ...